Which one of the following is not a deuterostome?

Which one of the following animals is correctly matched with its one characteristic and the taxon?

Mention one example each for animals with a chitinous exoskeleton and those covered by a calcareous shell.

Write one example for each of the following in the space provided:
$(a)$ Cold-blooded animal.
$(b)$ Warm-blooded animal.
$(c)$ Animal possessing dry and cornified skin.
$(d)$ Dioecious animal.

Give one example each for an animal possessing placoid scales and that with cycloid scales.

Haemocoel is found in